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The starting point for the walk is at Port de Saint-Gervais, south of Vinay, on the south bank of the Isère.
(S/E) Leave the Port car park and follow the banks of the Isère in the direction of the current (south-west). Cross a small stone bridge over a stream. The road turns left; follow it to join the D1532 and cross it using the designated crossing. Continue straight ahead and turn right at the next intersection. Just before the small hamlet, turn left onto a small road at the corner of a house (it is very inconspicuous). You will come out opposite the municipal wash house (water point). Turn right. The street turns 90° twice
(1) You will arrive near the church, in the village square (water point). Continue straight ahead. Pass the primary school and take the first alley on the left at the square. Cross the esplanade along the cemetery (water point along the wall, outside).
(2) Opposite you, you will see the sign "Rovon - 225m". Take the road that climbs up alongside a walnut grove (Chemin du Mollard). Follow the yellow/green markings. At the sign for "Les Buissières - 235m", turn left. The small road turns into a dirt track. Ignore the path that branches off to the left. At a fork, take the left-hand path (still following the yellow/green markings). You will enter the hamlet of Les Rez.
(3) In the hamlet, turn right onto Chemin des Rez, heading towards the oil press, which you will pass. The small road turns right on its own. In a walnut grove, ignore the two paths that branch off to your left and climb slowly but surely up Chemin des Gorges du Gorgonnet. Climb with the cliff on your right and the precipice on your left. The atmosphere is unique. Even though the path is wide and even, keep a close eye on children until you reach the footbridge. At times, there is no railing.
(4) When you reach the sign for "Passerelle de la Gaffe - 330m", descend to the left. You can explore both banks and enjoy this special spot. Once you have crossed the footbridge, climb back up a fairly wide track, which you will take on the left when you decide to leave. You will very quickly arrive in a small valley, which you descend.
(5) At the sign for "Le Moléron - 300m", follow the stony path on the left. Be careful, as you will very quickly come to a path on the right that is very difficult to see at first. This will take you to a pig farm (no pun intended)... When you reach the farm, take the road downhill on the left. Very soon, you will see a sign for "Réservoir de la Gabouille - 280m". Go downhill on the left. You will come to a road with a hairpin bend. Go down the road on the right.
(6) When you reach the sign for "sous le Rocher - 225m", continue along the small road to the left. Follow it until the sign tells you to turn left.
(7) You will immediately come to a small bridge over a river, followed by a sign for "Le Pont de La Drevenne - 198m". Continue down the small road. When you reach the Croix de Rebichon, turn right. The small road winds through walnut groves. Pass a dead end on your right.
(8) You will come to a small road (signposted "Chamounier - 200m"). Turn right and return to the D1532, but this time you will have a traffic light to cross. Continue straight ahead (be careful, there is no pavement or hard shoulder for a short distance). Your street will turn right automatically, taking you back to the bridge where you started and your car park (S/E).
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